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Physics 121P, Spring 2014
Unit 7
Unit 7 Work and Energy (chapter 7, Fundamentals of Physics 10th edition)
Introduction
The previous units have led up to an understanding of Newtons Laws of motion,
which contain all of the information needed to predict the

Physics 121P, Spring 2014
Unit 1
Unit 1 Measurement, Numbers, and Physical Units
Introduction
Chapter 1 - Fundamentals of Physics (10th edition).
As a physicist, one tries to make observations of the surrounding universe which can be
expressed as numbers.

Lecture 7. Application of
Newtons Laws
Newtons third law
Application of Newtons laws
Friction
1
Summary of Previous Lecture
Newtonian Mechanics
Forces are pushes or pulls
Forces cause acceleration
Mass
Newton's First Law
If there is no net force on a
b

About Midterm 2 on 3/17
Assignment 7 due at 9:00pm, Wednesday, March
16. The solutions posted at the same time, and no
late homework.
The exam will be held from 9:40 to 10:55am on
Thursday, March 17 in Hoyt Hall.
Chapters 7-10 will be covered.
Closed-

About Midterm 3 on 4/12
Assignment 10 due at 9:00pm, Monday, April 11.
The solutions posted at the same time, and no late
homework.
The exam will be held from 9:40 to 10:55am on
Tuesday, April 12 in Hoyt Hall.
Chapters 11-14 will be covered.
Closed-bo

PHY 122 HW 2 Solutions
1. For a spherical surface centered around a point charge, the formula for electric flux E = E dA simplifies to
E = EA. Why? If our spherical surface is surrounding an electric dipole rather than a point charge, this simplification

PHY 122 HW 5
1. A square parallel plate capacitor has sides with a length of 1cm and a separation
between the plates of 1 m. If we fill the capacitor with a dielectric in order to
achieve a capacitance of 0.1 F, what does the dielectric constant need to b

PHY 122 HW 12
1. For the circuit below, draw phasors for I1 , I2 with Vab . Hint: start with Vab and I1 . Write an expression relating I1 and
I2 .
2. You are being held hostage on a jungle island by guerillas, not gorillas (bonus points if you know what m

PHY 122 HW 2
1. For a spherical surface centered around a point charge, the formula for electric flux E = E dA simplifies to
E = EA. Why? If our spherical surface is surrounding an electric dipole rather than a point charge, this simplification
does not w

PHY 122 HW 7
~ which is perpendicular to the particles velocity, ~v . Will its
1. An electron enters a region of uniform magnetic field, B,
kinetic energy increase, decrease, or stay the same? Explain.
Solution: Since the particle is in circular motion,

PHY 122 HW 6 Solutions
1. Explain the difference between EMF and terminal voltage in an ideal battery.
Give an example where the difference between the two might matter.
Solution: The EMF () is the potential difference between the terminals
when no curre

Lecture 10. Potential energy
Work by general force
Power
Potential energy
Conservation of Mechanical
Energy
1
Summary of Previous Lecture
Kinetic Energy
The energy associated with
motion
Work
Energy transferred to or from an
object via a force
Can be posi

Lecture 17. Equilibrium
Static Equilibrium
Elasticity
Stress and strain
1
Summary of Previous Lecture
Angular Momentum of
a Particle
Angular Momentum of a
Rigid Body
Newton's Second Law
in Angular Form
Conservation of Angular
Momentum
Precession of a G

About Final Exam on 5/5
The exam will be held from 7:15 to 10:15pm on
Thursday, May 5 in Hoyt Hall.
Chapters 1-17 will be covered.
Closed-book exam. Allowed 1 page (8.5x11 in.) of
summary sheet and a scientific calculator.
There will be 10 problems. T

Recent Documents

Lecture 18. Gravitation
Newtons law of gravitation
Gravitational potential
Keplers laws
1
Summary of Previous Lecture
Static Equilibrium
Tension and
Compression
E is Young's modulus
Center of Gravity
If the gravitational
acceleration is the same
for al

About Midterm 1 on 2/16
Assignment 4 Due at 9:00pm, Monday, Feb. 15.
The solutions of Assignment 4 will be posted at the
same time, and no late homework will be accepted.
The exam will be held from 9:40 to 10:55am on
Tuesday, Feb. 16 in Hoyt Hall.
Chap